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Common models and industries of slewing bearings

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Rotary bearings: single row ball bearings (01 series, HS series, Q series), double row ball bearings (02 series), three row roller bearings (13 series), single row cross roller bearings (11 series), double row ball bearings (07 series), and lightweight series rotary bearings. Series products can be provided according to the national machinery industry standard JB/T2300-2015, with product models covering various standard and non-standard specifications from 150mm to 4500mm

Single row four point contact ball type rotary bearing (01 series)
The single row four point contact ball type slewing bearing consists of two seat rings, with a compact structure, light weight, and four point contact between the steel ball and the circular arc raceway. It can simultaneously withstand axial force, radial force, and overturning moment. Construction machinery such as rotary conveyors, welding operators, small and medium-sized cranes, and excavators can all be selected.

Double row reducing ball rotary bearing (02 series)

The double volleyball type slewing bearing has three race rings, and the steel balls and isolation blocks can be directly arranged into the upper and lower raceways. According to the force conditions, two rows of steel balls with different diameters are arranged. This open assembly is very convenient, with a bearing angle of 90 ° for both the upper and lower circular arc raceways, which can withstand large axial forces and overturning moments. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The axial and radial dimensions of the double row reducing ball slewing bearing are relatively large, and the structure is tight. Specially suitable for tower cranes, truck cranes, and other loading and unloading machinery that require a medium or larger diameter
Single row cross roller rotary bearing (11 series)
The single row cross roller rotary bearing consists of two race rings, with a compact structure, light weight, high manufacturing accuracy, small assembly clearance, and high requirements for installation accuracy. The rollers are arranged in a 1:1 cross pattern, which can simultaneously withstand axial force, overturning moment, and large radial force. It is widely used in lifting transportation, engineering machinery, and military products.
Three row roller type slewing bearing (13 series)
The three row roller type slewing bearing has three race rings, with separate upper, lower, and radial raceways, allowing the load on each row of rollers to be accurately determined. Being able to withstand various loads simultaneously, it is the product with the highest load-bearing capacity among the four types. Its shaft and radial dimensions are relatively large, and its structure is sturdy. It is particularly suitable for heavy machinery that requires larger diameters, such as bucket wheel excavators, wheel cranes, marine cranes, port cranes, steel waterway turntables, and large tonnage truck cranes.
Lightweight series slewing bearing (WD series)

Lightweight slewing bearings have the same structural form as ordinary slewing bearings, with light weight and flexible rotation. Widely used in food machinery, filling machinery, environmental protection machinery and other fields.
Single row four point contact ball type rotary bearing (HS series)
The single row four point contact ball type slewing bearing consists of two race rings, with a compact structure and four point contact between the steel ball and the circular arc raceway. Mainly used on machinery such as automobile cranes, tower cranes, excavators, pile drivers, construction vehicles, radar scanning equipment, etc. that can withstand overturning moments, vertical axial forces, and horizontal tilting forces.
Single row cross roller rotary bearing (HJ series)

The single row cross roller rotary bearing consists of two race rings, with a compact structure, high manufacturing accuracy, small assembly clearance, and high requirements for installation accuracy. The rollers are arranged in a 1:1 cross pattern, which can simultaneously withstand axial force, overturning moment, and large radial force. It is widely used in transportation, engineering machinery, and military products.
Single row four point contact ball type rotary bearing (Q series)

Single row four point contact ball type slewing bearing, consisting of two seat rings, has a compact structure and light weight. The steel ball is connected to the circular isolated raceway at four points, and can simultaneously withstand axial force, overturning moment, and large radial force. It is suitable for rotary conveyors, welding operators, small and medium-sized overweight machines, and excavators.

Ship industry slewing bearings

Standard CB/T3669-1999. Suitable for marine crane slewing bearings. Also applicable to offshore crane slewing bearings.

2025-01-09/0 Comments/by admin

Introduction to main bearings of shield tunneling machine

The main bearing of the shield machine, also known as the rotary table bearing or slewing support of the shield machine,
It is one of the core components of the shield machine, installed between the cutterhead and the shield body of the shield machine. Its main function is to support the weight of the shield machine cutterhead, withstand the huge axial force, radial force, and overturning moment generated by the cutterhead during excavation, and provide stable rotational support for the cutterhead to ensure that it can rotate and cut soil according to design requirements, achieving the excavation function of the shield machine.
Structural features: Large size and high precision: The main bearings of shield tunneling machines usually have a large diameter, usually around 3 to 6 meters, to adapt to different diameters of shield tunneling machine cutterheads. At the same time, in order to ensure the rotational accuracy and stability of the cutterhead, the manufacturing accuracy of the main bearing is extremely high, such as the radial and axial runout tolerances of the bearing are usually controlled within a few threads.
Multi row roller structure: The common main bearings of shield tunneling machines adopt a three row roller structure, including two rows of tapered rollers and one row of cylindrical rollers. Among them, two rows of tapered rollers mainly bear axial force and overturning moment, while one row of cylindrical rollers mainly bear radial force. This multi row roller structure can effectively distribute the load, improve the bearing capacity and service life.
Special sealing design: Due to the complex geological conditions underground, the main bearing of the shield machine needs to have good sealing performance to prevent soil, water, and other impurities from entering the bearing and affecting its normal operation. The main bearing usually adopts a combination of multiple lip seals and labyrinth seals to form a reliable sealing system. At the same time, special sealing grease is injected into the sealing structure to further improve the sealing effect.
Working principle: The main bearing of the shield machine is connected to the cutterhead and shield body through the inner and outer rings. When the drive system of the shield machine is started, the drive motor drives the inner or outer ring of the main bearing to rotate through transmission devices such as reducers, which in turn drives the cutterhead to rotate. During the rotation of the cutterhead, the rollers of the main bearing roll in the raceway, transmitting the load generated by the cutterhead to the shield body while ensuring the rotational accuracy and stability of the cutterhead. The lubrication system inside the main bearing continuously supplies lubricating oil between the rollers and raceways, reducing friction and wear, lowering the operating temperature of the bearing, and ensuring reliable operation of the main bearing under high load and long-term working conditions.
Technical requirements: High bearing capacity: Based on the excavation capacity of the shield machine and the diameter of the cutterhead, the main bearing needs to be able to withstand axial and radial forces of tens or even hundreds of tons, as well as overturning moments of thousands of Newton meters.
Long service life: A single excavation task of a shield machine usually takes several months or even years, requiring the main bearings to operate stably and without failure throughout the entire excavation process. Therefore, its design service life is generally more than 10 years, and it can withstand multiple load cycles during its service life.
Good reliability and stability: Once the main bearing fails during the shield tunneling process, it will cause the entire shield construction to come to a halt, resulting in huge economic losses and project delays. Therefore, the main bearing needs to have extremely high reliability and stability, and be able to work normally in complex geological conditions and harsh working environments.
In the past, the development status of China’s shield tunneling machine industry was constrained by the long-term dependence on imports for the main bearings of shield tunneling machines. In recent years, with the continuous improvement of China’s scientific and technological level, some domestic enterprises and research institutions have increased their investment in the research and development of shield machine main bearings, achieving certain breakthroughs. At present, some domestic enterprises have independently developed shield machine main bearings that meet certain engineering requirements, and have been applied in some domestic shield construction projects, gradually realizing the localization replacement of shield machine main bearings.

2025-01-07/0 Comments/by admin

How can slewing bearing manufacturers improve production efficiency?

How can slewing bearing manufacturers improve production efficiency

As an important mechanical component that connects rotating and fixed parts, slewing bearings have a wide range of applications in various fields such as engineering machinery, metallurgical machinery, and port machinery. For slewing bearing manufacturers, improving production efficiency is not only the key to reducing costs and enhancing market competitiveness, but also an important way to meet the growing demands of customers. This article will explore how rotary bearing manufacturers can improve production efficiency from the aspects of structural design, material selection, heat treatment process, precision manufacturing process, and production process optimization.

1. Optimize structural design

The structural design of slewing bearings directly affects their load-bearing capacity and installation convenience. In order to improve production efficiency, slewing bearing manufacturers should pay attention to the compactness and rationality of structural design. For example, adopting a multi row roller column design (such as a three row roller column) or a four point contact ball structure design can effectively disperse loads, improve overall load-bearing capacity, while reducing material usage and weight, and lowering production costs. In addition, by optimizing product design and reducing unnecessary processing steps and assembly processes, production efficiency can also be significantly improved.

2. Carefully selected high-quality materials

The selection of materials is crucial for the performance and production efficiency of slewing bearings. Rotary bearing manufacturers should choose high-quality alloy steel materials with high strength, high wear resistance, and good hardenability, such as 42CrMo, 5CrMnMo, etc. These materials not only meet the load-bearing capacity requirements of heavy machinery, but also exhibit better performance during heat treatment. By strict material screening and quality control, we ensure stable quality of raw materials and reduce production delays and cost increases caused by material issues.

3. Improve heat treatment process

Heat treatment is an important means to improve the bearing capacity and extend the service life of slewing bearings. Rotary bearing manufacturers should adopt advanced heat treatment techniques, such as surface induction hardening technology, to improve the hardness and wear resistance of the raceway. During the heat treatment process, it is necessary to strictly control the heating temperature, heating speed, and sensor quality to ensure the consistency and stability of the quenching effect. Meanwhile, tempering treatment after quenching is also essential, as it can eliminate quenching stress, improve material toughness, and prevent cracks and fractures during use.

4. Strengthen precision manufacturing processes

Precision manufacturing processes are crucial for producing high-quality rotary bearings. Manufacturers of slewing bearings should use world leading CNC machine tools and precision grinding equipment to ensure machining accuracy reaches the micrometer level. By precisely calculating and controlling the tooth profile of gears, the smoothness and dimensional tolerances of bearings, and other details, the accuracy and performance of slewing bearings can be improved. In addition, using special heat treatment techniques to optimize the internal structure of the metal can further improve the bearing capacity and fatigue strength of the slewing bearing.

5. Optimize the production process

Optimizing the production process is the key to improving production efficiency. Rotary bearing manufacturers should introduce advanced production management systems, such as ERP (Enterprise Resource Planning) systems, to achieve automation and intelligent management of production planning. Through the ERP system, enterprises can monitor production progress, inventory status, and equipment status in real time, adjust production plans in a timely manner, and reduce waiting time and waste in the production process. At the same time, ERP systems can also provide data analysis functions to help enterprises extract valuable information from production data, assist in decision-making, and improve management efficiency.

6. Strengthen employee training and technical support

Employees are the main force of enterprise production, and their skill level and work attitude directly affect production efficiency. Rotary bearing manufacturers should strengthen training and technical support for employees, improve their professional skills and operational level. By regularly organizing technical lectures, skill training, and experience exchange activities, we aim to enhance employees’ technical literacy and overall quality. At the same time, establish a comprehensive technical support system to promptly solve problems and difficulties encountered by employees in the production process, ensuring smooth production.

epilogue

Improving production efficiency is the key to the sustainable development of rotary bearing manufacturers. By optimizing structural design, selecting high-quality materials, improving heat treatment processes, strengthening precision manufacturing processes, optimizing production processes, and enhancing employee training and technical support, rotary bearing manufacturers can significantly improve production efficiency, reduce production costs, enhance product quality and market competitiveness. In the future development, slewing bearing manufacturers should continue to uphold the spirit of innovation and craftsmanship, constantly pursue excellence and perfection, and provide customers with higher quality and more efficient products and services.

2024-09-07/0 Comments/by admin

Expert consultation system for management of large medical equipment

The national health and Family Planning Commission has issued a notice to establish a large medical equipment management advisory expert committee. At present, the large-scale medical equipment management advisory expert committee has been established. And implement the management measures for large medical equipment management consulting experts. According to the measures, the national health and Family Planning Commission implements an expert consultation system in the formulation of management policies for large-scale medical equipment, the preparation of configuration planning, and the implementation of configuration evaluation.

According to reports, large-scale medical equipment refers to the medical equipment listed in the management items of the health administration department under the State Council, as well as the complete set of medical equipment with a unit price of more than 5 million yuan which has not been listed in the management items and is first configured in the provincial areas. The allocation of large medical equipment must be suitable for China’s national conditions and regional health planning principles, and fully take into account the advanced nature, suitability and accessibility of technology. The national health and Family Planning Commission has formulated the management measures for large medical equipment management consulting experts, aiming to strengthen the management of large medical equipment, give full play to the role of experts in decision-making and consultation, and promote standardized, scientific and refined management.

The “experts” mentioned in the “methods” refer to the personnel in the fields of Radiology, radiotherapy, oncology, nuclear medicine, medical engineering, health management, etc., who are entrusted by the national health and Family Planning Commission to participate in the management and consultation of large-scale medical equipment in an independent capacity.

2020-05-08/0 Comments/by admin